Oil and gas pipeline sleeve protection structure

Abstract

The utility model discloses an oil and gas pipeline casing pipe protection structure which comprises an oil and gas pipeline, an isolation steel casing pipe, a steel pipe, a first annular plugging part and a second annular plugging part, the isolation steel casing pipe is arranged outside the oil and gas pipeline in a sleeved mode, and an annular space is formed between the isolation steel casing pipe and the oil and gas pipeline. The first annular plugging part and the second annular plugging part are arranged between the two ends of the isolation steel sleeve and the oil and gas pipeline respectively, the two ends of the annular space are plugged through the first annular plugging part and the second annular plugging part respectively, one end of the steel pipe is located in the annular space, and the other end of the steel pipe is located in the oil and gas pipeline. The other end of the steel pipe penetrates out of the first annular plugging part, and cement paste is poured into the annular space. The technical scheme is used for solving the problem that potential safety hazards are caused by a seepage channel existing in an annulus of an existing directional drill penetrating through an isolation sleeve.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas pipeline construction, and in particular relates to an oil and gas pipeline casing protection structure. Background Art

[0002] With the development of trenchless technology for oil and gas pipelines, directional drilling has become a common means for trenchless crossing of rivers for oil and gas pipelines. When directional drilling crosses unfavorable strata, it is often necessary to set casing at the entry and exit points to isolate the unfavorable strata. However, due to the annulus between the casing and the pipeline, the infiltrating water can easily form a seepage channel along the gap, and the fine particles in the soil at the lower end of the casing are also likely to move and lose in the pore channel formed. The pores of the soil continue to expand, and the seepage volume also increases accordingly, eventually leading to the formation of a through seepage channel in the soil body, and the soil body is damaged. Especially when the flood level is high and there is a head difference, the risk of the formation of a seepage channel is high, which may endanger the safety of the flood control embankment in serious cases.

[0003] In recent years, the government's water conservancy departments have paid more and more attention to the impact of underground river-crossing projects on flood control, especially the increasingly high requirements for directional drilling crossing plans. Many experts pointed out in flood control evaluation meetings that the annulus between the casing and the pipeline may cause safety risks to the embankment, and required the design to pay attention and take relevant design measures to ensure the safety of the embankment.

[0004] Traditional directional drilling crossing projects only use clay ramming to respond to flood control assessment requirements, without treating the gap between the casing and the pipeline. In addition, since the casing annulus is directly connected to the soil, the depth of the clay ramming entering the annulus is difficult to control, and its construction quality is difficult to ensure. Traditional clay ramming can no longer meet the flood control assessment requirements, so a new method is needed to seal the annulus of the directional drilling crossing isolation casing. Utility Model Content

[0005] In response to the above-mentioned technical problems, the utility model provides an oil and gas pipeline casing protection structure to solve the safety hazard caused by the existence of seepage channels in the annulus of the isolation casing when the existing directional drilling passes through. The oil and gas pipeline casing protection structure can effectively improve the safety of directional drilling of oil and gas pipelines.

[0006] The utility model provides an oil and gas pipeline casing protection structure, comprising an oil and gas pipeline, an isolation steel casing, a steel pipe, a first annular sealing portion and a second annular sealing portion, the isolation steel casing is sleeved on the outside of the oil and gas pipeline, and an annular space is formed between the isolation steel casing and the oil and gas pipeline, the first annular sealing portion and the second annular sealing portion are respectively arranged between the two ends of the isolation steel casing and the oil and gas pipeline, the first annular sealing portion and the second annular sealing portion respectively seal the two ends of the annular space, one end of the steel pipe is located in the annular space, the other end of the steel pipe passes through the first annular sealing portion, and cement slurry is poured into the annular space.

[0007] Furthermore, the oil and gas pipeline is arranged at an angle, the first annular sealing portion is located at an end of the oil and gas pipeline with a higher horizontal height, and the second annular sealing portion is located at an end of the oil and gas pipeline with a lower horizontal height.

[0008] Furthermore, there are multiple steel pipes, which are parallel to each other and spaced apart on the outer circumference of the oil and gas pipeline.

[0009] Furthermore, the first annular sealing portion is a machine brick.

[0010] Furthermore, the second annular sealing portion is an annular rubber baffle.

[0011] The oil and gas pipeline casing protection structure provided by the utility model can effectively block the seepage channel formed by the annular space under the action of the water head, greatly reduce the risk of dam collapse, ground subsidence or other risks above the pipeline, and meet the increasingly stringent requirements of domestic underground crossing engineering safety and flood control evaluation. The construction process is simple and easy to operate, the construction quality can be guaranteed, and the construction period and investment are effectively reduced. It also further improves the application field of directional drilling crossing, and has great social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of an oil and gas pipeline casing protection structure;

[0014] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0015] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0016] Figure 4 for Figure 1 Cross-sectional view of CC. DETAILED DESCRIPTION

[0017] The utility model discloses a three-dimensional rotary plant root division hydroponic device, which fully utilizes the longitudinal space and can make the light sources received by plants on all root division hydroponic tubes consistent, realizes automatic circulation and reduces manual operation.

[0018] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, what is described is only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] See also Figure 1 to Figure 4 As shown, the utility model discloses an oil and gas pipeline casing protection structure, including an oil and gas pipeline 3, an isolation steel casing 2, a steel pipe 1, a first annular sealing portion 4 and a second annular sealing portion 6, the isolation steel casing 2 is sleeved on the outside of the oil and gas pipeline 3, and an annular space 5 is formed between the isolation steel casing 2 and the oil and gas pipeline 3, the first annular sealing portion 4 and the second annular sealing portion 6 are respectively arranged between the two ends of the isolation steel casing 2 and the oil and gas pipeline 3, the first annular sealing portion 4 and the second annular sealing portion 6 respectively seal the two ends of the annular space 5, one end of the steel pipe 1 is located in the annular space 5, the other end of the steel pipe 1 passes through the first annular sealing portion 4, and the annular space 5 is poured with cement slurry.

[0020] The oil and gas pipeline 3 is arranged obliquely, the first annular sealing portion 4 is located at an end of the oil and gas pipeline 3 with a higher horizontal height, and the second annular sealing portion 6 is located at an end of the oil and gas pipeline 3 with a lower horizontal height.

[0021] There are a plurality of steel pipes 1 , and the plurality of steel pipes 1 are parallel to each other and spaced apart on the outer circumference of the oil and gas pipeline 3 .

[0022] The first annular sealing portion 4 is a machine brick.

[0023] The second annular sealing portion 6 is an annular rubber baffle.

[0024] The oil and gas pipeline casing protection structure is provided with an isolation steel casing 2 on one side of the oil and gas pipeline 3, and an annular space 5 between the isolation steel casing 2 and the oil and gas pipeline 3. The lower end of the annular space 5 of the isolation steel casing 2 is sealed with an annular rubber baffle, and the upper end is sealed with machine bricks. A grouting hole is reserved at the upper end of the annular space 5 of the isolation steel casing 2, and a steel pipe 1 is extended through the grouting hole. Cement slurry is injected into the closed annular space 5 by the steel pipe 1 to achieve the effect of sealing the gap between the casing and the pipeline.

[0025] The oil and gas pipeline casing protection structure provided by the utility model can effectively block the seepage channel formed by the annular space 5 under the action of the water head, greatly reducing the risk of dam collapse, ground subsidence or other risks above the pipeline, and at the same time meet the increasingly stringent requirements of domestic safety and flood control evaluation of underground crossing projects, the construction process is simple, easy to operate, the construction quality can be guaranteed, and the construction period and investment are effectively reduced. It also further improves the application field of directional drilling crossing, with great social and economic benefits.

[0026] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An oil and gas pipeline casing protection structure, characterized in that: It includes an oil and gas pipeline, an isolation steel casing, a steel pipe, a first annular sealing part and a second annular sealing part. The isolation steel casing is sleeved on the outside of the oil and gas pipeline, and an annular space is formed between the isolation steel casing and the oil and gas pipeline. The first annular sealing part and the second annular sealing part are respectively arranged between the two ends of the isolation steel casing and the oil and gas pipeline, and the first annular sealing part and the second annular sealing part respectively block the two ends of the annular space. One end of the steel pipe is located in the annular space, and the other end of the steel pipe passes through the first annular sealing part. Cement slurry is poured into the annular space.

2. The oil and gas pipeline casing protection structure according to claim 1, characterized in that: The oil and gas pipeline is arranged obliquely, the first annular sealing portion is located at an end of the oil and gas pipeline with a higher horizontal height, and the second annular sealing portion is located at an end of the oil and gas pipeline with a lower horizontal height.

3. The oil and gas pipeline casing protection structure according to claim 1, characterized in that: There are multiple steel pipes, which are parallel to each other and spaced apart on the outer circumference of the oil and gas pipeline.

4. The oil and gas pipeline casing protection structure according to claim 1, characterized in that: The first annular sealing part is a machine brick.

5. The oil and gas pipeline casing protection structure according to claim 1, characterized in that: The second annular sealing portion is an annular rubber baffle.

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